The I/O MAG™, utilizing Smith MAG™ lens change system, is designed for optimized performance and perfected fit: two locking mechanisms for lens security, AirEvac™ ventilation for fog-free integration with Smith helmets, and a frame designed for conoured face fit. All this technology is designed around one of Smith's largest spherical lenses, providing a maximized filed of view and 5X™ anti-fog technology. The I/O MAG™ was designed through a process of reducing elements to only the most essential, so there's nothing getting in the way of a great day on the Mountain.